Refractive index

• Definition

  Refractive Index is defined as the degree of how the incoming light from vacuum is bent when passing through a medium. It is calculated by dividing the speed of light in vacuum by that in the medium. Normally, the standard of refractive index is that for yellow light of sodium with the wavelength of 589.6nm.

• Estimation Method

  - MolInstincts: The Property value is estimated by the combination of fundamental thermodynamic theories, modern modeling approaches, QSPR (quantitative structure-property relationships) methods, and ANN (Artificial Neural Network) with over fitting prevention algorithm, utilizing the quantum chemical calculations results and molecular descriptors. The estimated value is finally determined after manual inspection.

• Supplementary Explanation on Accuracy

  Comment	Meaning of Comment
  ≤ 0.005	0 ≤ abs error ≤ 0.005
  ≤ 0.015	0.005 < abs error ≤ 0.015
  ≤ 0.025	0.015 < abs error ≤ 0.025
  ≤ 0.035	0.025 < abs error ≤ 0.035
  > 0.035	abs error > 0.035
  Exp. Data Unavailable	Experimental Data are Unavailable

  Where absolute error means the absolute value of (experimental value)-(calculated value).